Pass implementation object to supplemental classes by reference

Source/core/frame/Frame.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Simon Hausmann <hausmann@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  *                     2001 George Staikos <staikos@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2005 Alexey Proskuryakov <ap@nypop.com>
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 581 matching lines @@
 }
 
 void Frame::notifyChromeClientWheelEventHandlerCountChanged() const
 {
     // Ensure that this method is being called on the main frame of the page.
     ASSERT(isMainFrame());
 
     unsigned count = 0;
     for (const Frame* frame = this; frame; frame = frame->tree().traverseNext()) {
         if (frame->document())
-            count += WheelController::from(frame->document())->wheelEventHandlerCount();
+            count += WheelController::from(*frame->document())->wheelEventHandlerCount();
     }
 
     m_host->chrome().client().numWheelEventHandlersChanged(count);
 }
 
 bool Frame::isURLAllowed(const KURL& url) const
 {
     // We allow one level of self-reference because some sites depend on that,
     // but we don't allow more than one.
     if (page()->subframeCount() >= Page::maxNumberOfFrames)
@@ skipping 114 matching lines @@
 {
     if (!m_host)
         return 0;
 
     double ratio = m_host->deviceScaleFactor();
     ratio *= pageZoomFactor();
     return ratio;
 }
 
 } // namespace WebCore